Interfacial rates of reaction of CO2 with liquid iron silicates, silica-saturated manganese silicates, and some calcium iron silicates

El-Rahaiby, S. K.; Sasaki, Yasushi; Gaskell, D. R.; Belton, G. R.

doi:10.1007/bf02655077

Cited by 42 publications

(83 citation statements)

References 12 publications

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“…Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction. Nagasaka et al 6) also measured the reduction rate of molten iron oxide contained in an iron crucible under strong CO gas flow by using thermobalance in the temperature range of 1 673 to 1 723 K. Measured reduction rate constants were quite in good agreement with those measured by Tsukihashi et al Meanwhile, the dissociation rates of CO 2 on the surface of molten oxides containing iron oxide have been measured by Sasaki et al, 3) ElRahaiby et al, 7) Sun et al 8) and Mori et al 11) with isotope exchange technique. If the dissociation of CO 2 is the rate determining step of oxidation of molten oxide, the reduction rate could be calculated from the measured dissociation rate constant.…”

Section: Introductionmentioning

confidence: 59%

“…Therefore, oxidation or reduction rates for FeO x -contained molten oxides have been widely investigated. [1][2][3][4][5][6][7][8][9][10][11][12][13] Researches about the reduction rate of FeO x and FeO x -based molten oxides with CO-CO 2 gas have been conducted by many researchers. Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction.…”

Section: Introductionmentioning

confidence: 99%

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Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Matsuura

Tsukihashi

2005

ISIJ Int.

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Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Matsuura

Tsukihashi

2005

ISIJ Int.

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“…The relationship of can be simply given and has been confirmed in some slag systems. 5,7,11) For the solid iron oxide system, the whole experimental system is in a chemical equilibrium, therefore it can be considered as a homogeneous phase. Especially in wüstite phase (Fe1-yO) region, the values of y change in the range of 0.05-0.12 at 1 273 K, 22) and it is acceptable that the effect of CO2/CO ratio on is so small that can be ignored.…”

Section: The Relationship Of Chemical Reaction Rate Con-mentioning

confidence: 99%

“…From the 1960s, the isotope exchange technique, as an effective experimental method to study the interfacial kinetics between gas and iron oxide, has been extensively used by many researchers in metallurgical field. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Recently, in order to meet the strong demand on the utilization of low grade iron ores and reduction of CO2 emission, the direct reduction of fine iron ore, as an innovative ironmaking process, has been given more attention. Therefore, the kinetics of CO2-CO reaction with the solid iron oxide became more important.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Rate of CO2^|^ndash;CO Reaction with the Solid Iron and Iron Oxide by Isotope Exchange Technique at 1273 K

Zhang

Yan

et al. 2012

ISIJ Int.

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The interfacial rate constant of CO2-CO reaction with the solid iron and iron oxide has been measured by means of the isotope exchange reaction at 1 273 K. Changing the total flowrate, the composition of CO2/CO of gas mixture and the reaction area, the effects of experimental conditions on rate constant were investigated. Varying the CO2/CO ratio in the range of 0.1 to 10, the dependence of rate constant on CO2/ CO ratio was studied. It is found that the relationship of the rate constant and CO2/CO ratio can be divided to three regions represented iron, wüstite and magnetite phase field, respectively. In three phase regions, the slopes of the linear relationship of logkc and log(CO2/CO) were about -0.48, -1.14 and -1.71, respectively. The microstructure of reaction surface of sample was also observed by SEM, with the CO2/CO ratio, the reacted surface became less smooth and showed the crystal morphology.

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“…Reaction (1) may be assumedto occur by the reactions (2) and (3), which may be expressed by following elementary steps (4), (5) and (6).…”

mentioning

confidence: 99%

Determination of the Rate of CO2 Dissociation on the Surface of CaO-SiO2, CaO-Al2O3, CaO-SiO2-CaF2 and CaO-SiO2-FexO Melts.

1996

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The rate constant of C02 dissociation on the surfaces of CaO-Si02' CaO-Al203' CaO-Si02-CaF2and CaO-Si02-Fe.Oslags was measuredby means of a 13C02-CO isotope exchangetechnique as functions of slag basicity, iron content, temperature and imposed equilibrium C02/CO ratio, It was shown that CaOSi02-Fe*O slags with low iron content and those with high iron content had different rate determining steps, According to those rate determining steps, the apparent rate constant, k., was ca]culated for each slag. Consequently, we obtained the equations: k. =k(1 -~iei) and k.=k(1 -~iei) ( If weassume that the dissociation of adsorbed C02 on the surface of slag controls an overall reaction, with the adsorption equilibrium for C02and CO, reactions (4) and (6) that the reverse rate of reaction (7) may be negligible.Therefore, the measurement of the forward rate of reaction (7) mol~1)) is the gas constant. AP*3c0= and (P*3co)*q are the partial pressure decrease of P*=c02 by reaction (7) and the partial pressure of P*3co when the complete isotope exchangeequilibrium was achieved, respectively. Hereafter, the left hand side of Eq. (9) will be represented by k* as the apparent forward rate constant.2.2. Experimental ArrangementThe experimentai arrangement is shown in Fig. l Fig. 8.

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Interfacial rates of reaction of CO2 with liquid iron silicates, silica-saturated manganese silicates, and some calcium iron silicates

Cited by 42 publications

References 12 publications

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Interfacial Rate of CO2^|^ndash;CO Reaction with the Solid Iron and Iron Oxide by Isotope Exchange Technique at 1273 K

Determination of the Rate of CO2 Dissociation on the Surface of CaO-SiO2, CaO-Al2O3, CaO-SiO2-CaF2 and CaO-SiO2-FexO Melts.

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